Hi all
This is a little bit OT for this newsgroup, but I intend to use python
for prototyping at least, and I know there are a lot of knowledgeable
people using Python in a Network context here...
I have a use case of a single 'master' machine which will need to
periodically 'push' data to a variety of 'slave' devices on a small local
subnet, over Ethernet. We are talking perhaps a dozen devices in all with
comms occurring perhaps once very few seconds, to much less often - once per
half an hour, or less. There is probably an upper bound of 64KB or so of
data that is likely to be sent on each occasion.
Previous similar systems have attempted to do this by maintaining multiple
long-term TCP connections from the master to all the slave devices. The
Master is the server and the slaves periodically check the master to see
what has changed. Although this ... works ..., we have had trouble
maintaining the connection, for reasons ... I am not yet fully aware of.
We are now considering an alternative approach where the master maintains a
list of slave devices and acts as a client. Each device is a server from the
point of view of data transfer. We would then use a short-lived TCP
connection when data is available; the Master would connect to each slave
which needed the data, send it, and close the connection.
I should also add that we desire our system to be 'robust' in the face of
situations such as cable unplugging, device power cycles, etc.
Although this might get round some of our current problems, I can see that
we might end up with new problems to deal with. I am wondering if this
scenario rings bells with anyone, and seeking pointers to what has been done
elsewhere. As I say, I am expecting to prototype it in Python so any
specifics also welcome!
(suggestions as to a better forum to ask for previous experience also
gratefully received)
Thanks al lot for any thoughts/suggestions
Jon N
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